<template>
  <div class="todo-footer" v-show="total">
    <label>
      <!-- <input type="checkbox" :checked="isAll" @click="checkAll" /> -->
      <input type="checkbox" v-model="isAll" />
    </label>
    <span>
      <span>已完成{{ doneTotal }} </span>/全部{{ total }}
    </span>
    <button class="btn btn-danger" @click="clearAll">清除已完成的任务</button>
  </div>
</template>

<script>
// import { get } from 'http'

export default {
  name: 'MyFooter',
  props: ['todos', 'checkAllTodo', 'clearAllTodo'],
  computed: {
    // doneTotal() {
    //   let count = 0
    //   this.todos.forEach((todo) => {
    //     if (todo.done) {
    //       count++
    //     }
    //   })
    //   return count
    // },
    //统计勾选的个数
    doneTotal() {
      return this.todos.reduce((pre, todo) => {
        return pre + (todo.done ? 1 : 0)
      }, 0)
    },
    //todos数组的总长度
    total() {
      return this.todos.length
    },
    //底部全选框是否选中或取消
    isAll: {
      get() {
        return this.doneTotal === this.total && this.total > 0
      },
      set(value) {
        this.checkAllTodo(value)
      },
    },
  },
  methods: {
    //全选与APP组件交互
    // checkAll(e) {
    //   this.checkAllTodo(e.target.checked)
    //   // console.log(e.target.checked)
    // },
    clearAll() {
      this.clearAllTodo()
    },
  },
}
</script>

<style>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
